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ECOFRIENDLY MANAGEMENT OF LEAF BLIGHT OF SUNFLOWER CAUSED BY Alternaria helianthi (HANSF.) TUBAKI AND NISHIHARA

KrishiKosh

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Title ECOFRIENDLY MANAGEMENT OF LEAF BLIGHT OF SUNFLOWER CAUSED BY Alternaria helianthi (HANSF.) TUBAKI AND NISHIHARA
 
Creator G, VIJAYALAKSHMI
 
Contributor K, KARUNA
 
Subject weeds, control methods, millets, organic compounds, sowing, herbicides, yields, drying, grain, rice
 
Description Biological control of plant pathogens through antagonistic microorganisms is a
potential and ecofriendly and alternative to the chemical management of diseases.
Alternaria leaf blight is an important destructive disease of sunflower commonly
managed using chemicals. Screening of one hundred and forty six germplasm lines or
coordinated trial entries of sunflower against Alternaria leaf blight disease under field
conditions revealed that none of them was immune or highly resistant. Whereas, forty
eight germplasm and eleven coordinated entries showed moderately resistant reaction
against Alternaria leaf blight disease. In vitro evaluation of antagonistic microorganisms
revealed that maximum inhibition of mycelial growth of Alternaria helianthi was
recorded with native Trichoderma viride (85.33%) followed by T. viride strain16
(79.33%) and native T. harzianum (76.44%). Culture filtrates of bioagents found
effective in vitro were evaluated for their efficacy in inhibiting dry mycelial weight and
radial growth of A. helianthi. T. viride inhibited the mycelia weight (202 mg) and radial
growth (36 mm). Evaluation of fungicides by food poison technique revealed that
maximum inhibition of A. helianthi was observed with Propiconozole (90.56 %) followed
by Mancozeb (86.85 %). Under artificially inoculated conditions, seed treatment with T.
viride @ 6g/kg or Mancozeb @ 3g/kg of seeds recorded the least disease severity of
25.49 and14.96 per cent respectively. However under field conditions, Propiconazole
recorded maximum yield of 2181.71kg/ha and least disease severity of 9.85 per cent
followed by T. viride culture filtrates recorded an yield of 1851.27 kg/ha and disease
severity of 23.23 per cent.
 
Date 2016-10-25T14:06:43Z
2016-10-25T14:06:43Z
2014-07-21
 
Type Thesis
 
Identifier Th-10832
http://krishikosh.egranth.ac.in/handle/1/81849
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences GKVK, Bangalore